Meatball Sub Casserole

1/3 cup chopped scallion
1/4 cup seasoned bread crumbs
3 tablespoons grated Parmesan cheese
1 pound ground beef
1 loaf Italian bread, cut into 1-inch slices
8 ounces cream cheese, softened
1/2 cup mayonnaise
1 teaspoon Italian seasoning
1/4 teaspoon pepper
2 cups shredded mozzarella cheese, divided
1 (28 ounce) jar spaghetti sauce
1 cup water
2 garlic cloves, minced

In a bowl, combine onions, crumbs and Parmesan cheese. Add beef and mix well. Shape into 1-inch balls. Place on a rack in a shallow baking pan. Bake at 400 degrees F for 15 to 20 minutes or until no longer pink.

Meanwhile, arrange bread in a single layer in an ungreased 13 x 9 x 2-inch baking dish (all of the bread might not be used).

Combine cream cheese, mayonnaise, Italian seasoning and pepper; spread over bread. Sprinkle with 1/2 cup mozzarella.

Combine sauce, water and garlic; add meatballs. Pour over cheese mixture. Sprinkle with remaining mozzarella cheese. Bake uncovered at 350 degrees F for 30 minutes or until heated through.